Install relief valve cover nut and tighten.
安装安全阀阀盖螺母，并加以紧固。
The corotation ladder-shaped cover nut is enclasping central tube, and easy to realize rapid dismantling.
正旋梯形螺母即抱紧中心管，实现快速联接和密封。
Through analyzing of a bottle cover structure with inner thread, a type of screw and nut with coarse pitch was applied to realize thread core demoulding automatically.
通过对一种带有内螺纹的酒瓶盖的结构分析，阐述了采用大导程螺杆和螺母机构实现螺纹型芯自动旋转脱模的设计过程及其工作过程。
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